Home / 3,121.07-4,681.59-1,271.78

Finding the Fourth Proportional to 3,121.07, 4,681.59 and 1,271.78

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Solution

The fourth proportional to 3,121.07, 4,681.59 and 1,271.78 is: 1,907.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.07 : 4,681.59 = 1,271.78 : x
  2. Step 2: Convert to fraction form
    3,121.07/4,681.59 = 1,271.78/x
  3. Step 3: Cross multiply
    3,121.07x = 4,681.59 × 1,271.78
  4. Step 4: Simplify right side
    3,121.07x = 5,953,929.12
  5. Step 5: Solve for x
    x = 5,953,929.12/3,121.07
  6. Step 6: Final answer
    x = 1,907.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.